Thanks Shane. :)
On the dial settings, those are the temp settings that the PCM will see.
What you want to try as a starting point is 12 O'clock. The average
range for best performance is from about 10-11 O'clock to 1-2 O'clock.
You don't want to set it too cold but I normally set mine about 20-25
degrees cooler that outside temp.
- Bernd
-----Original Message-----
From: owner-dakota-truck@buffnet.net
[mailto:owner-dakota-truck@buffnet.net] On Behalf Of Shane Moseley
Sent: Monday, July 02, 2001 1:26 PM
To: dakota-truck@buffnet.net
Subject: Re: DML: Bernd (or anyone) - ? about IAT Box...
Aajaynefour@cs.com wrote:
> Well, I finally got around to installing it yesterday and I am pleased
> with performance gains :) However, I have a couple of questions.
>
> 1.) If OBD II is in closed loop and is getting all of it's computer
> input from the O2 sensors, the how does the IAT sensor (or driver
> adjusted pot) have an effect on the fuel system? Does the computer
> still receive some input from the IAT in closed loop?
I can answer that one - the IAT output is used during almost all modes
of operation of the PCM. Even when in closed-loop. When in
closed-loop, it is true that the PCM ignores the IAT output when
determining general fueling (and
timing) strategy afterall by definition it is using the control source,
the O2 sensor. BUT anytime there is a change in TPS or MAP (load
triggers), if the delta is enough - then the IAT is used to calculate
the appropriate enrichment (pos or neg) to provide for smoother
driveability. If the delta is too much (cross some threshold) it will
transition into Open-Loop for a short period and then use the IAT along
w/the built-in tables to calculate fuel/spark delivery.
The battery voltage and temp are also used under ALL modes of PCM
operation. They can vary the pulsewidth delivered in ANY of the modes as
well.
> 2.) Do the temp. to dial settings you gave with the instruction sheet
> indicate the ambient (outside) temp. or the temp inside the intake
> manifold. If it 80 degrees outside and I set the dial at 12 o'clock,
> for example, is the computer going to think it is 50-52 degrees
> outside? Would it be better to set it at an even cooler setting?
That would be a Bernd question. What would be the ideal type of display
/ adjustment?
Latr,
Shane
-- '96 IndyRam-HisIndy-MPI/TB/Pulleys/AccelCoil/MPComp/HookerSuperComps/CompTAs '96 IndyRam-HerIndy-numbered(#142)"Track Truck" '74 Triple-Black Dodge Challenger Rallye 360 home-brew EFI R&D vehicle '68 Black Corvette Convertible 427 (For Sale)
This archive was generated by hypermail 2b29 : Fri Jun 20 2003 - 12:02:03 EDT